The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A086392 Numbers n such that n/2 is composite and F(n^2+1)==5 (mod n) where F(k) denotes the k-th Fibonacci number. 0
 8, 42, 88, 174, 232, 242, 248, 282, 322, 462, 488, 568, 572, 638, 646, 658, 682, 754, 796, 884, 902, 968, 1266, 1302, 1342, 1562, 1612, 1672, 1722, 1798, 1806, 1974, 1978, 2108, 2158, 2162, 2378, 2542, 2728, 2756, 2886, 3102, 3542, 3638, 3666, 3738, 3782 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS MATHEMATICA Select[Range[4000], CompositeQ[#/2]&&Mod[Fibonacci[#^2+1], #]==5&] (* Harvey P. Dale, Jan 11 2017 *) PROG (PARI) isok(n) = !(n%2) && !isprime(n/2) && ((fibonacci(n^2+1) % n) == 5); \\ Michel Marcus, Dec 06 2013 CROSSREFS Cf. A086367. Sequence in context: A295936 A352397 A204572 * A234860 A292059 A027903 Adjacent sequences:  A086389 A086390 A086391 * A086393 A086394 A086395 KEYWORD nonn AUTHOR Benoit Cloitre, Sep 06 2003 EXTENSIONS More terms from Don Reble, Sep 16 2003 More terms from Michel Marcus, Dec 06 2013 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified August 8 08:38 EDT 2022. Contains 356003 sequences. (Running on oeis4.)